It varied. Mine was 20 front, 17 rear so my first mod was a "sedan" OEM 20mm rear bar and solid endlinks, which was perfect for a first step for me. Then I went 22mm adjustable rear (and eventually front too) which worked well too.
Alignment makes a big difference. With your alignment, I'd say 22mm rear won't be enough, but you do have the fancy diffs (front LSD and DCCD center) so maybe that will help you get more throttle oversteer. Definitely give it a try, because driving style and what your used to will affect it, but I bet a 25-28mm rear bar would be better for autox in your car.
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Slow and low, that is the tempo.
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